Cell culture flask



FIG. 1 is an isometric view of a cell culture flask;

FIG. 2 is another isometric view thereof;

FIG. 3 is an end view thereof;

FIG. 4 is another end view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a side view thereof; and,

FIG. 7 is another side view thereof.

CLAIM The ornamental design for a cell culture flask, as shown.